?? pgm09_26.txt
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//// This file contains the C# code from Program 9.26 of// "Data Structures and Algorithms// with Object-Oriented Design Patterns in C#"// by Bruno R. Preiss.//// Copyright (c) 2001--2002 by Bruno R. Preiss, P.Eng. All rights reserved.//// http://www.brpreiss.com/books/opus6/programs/pgm09_26.txt//public class ExpressionTree : BinaryTree{ private class ExpressionVisitor : AbstractPrePostVisitor { StringBuilder builder = new StringBuilder(); public override void PreVisit(object obj) { builder.Append("("); } public override void InVisit(object obj) { builder.Append(obj); } public override void PostVisit(object obj) { builder.Append(")"); } public override string ToString() { return builder.ToString(); } } public override string ToString() { ExpressionVisitor visitor = new ExpressionVisitor(); DepthFirstTraversal(visitor); return visitor.ToString(); } // ...}
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